Spa Appointments on Bliss?

[gymbomb]

Does anyone know if spa appointments usually fill up quickly or are easy to get onboard? Bliss in March, Mexican Riviera. We're hoping to schedule massages on a port day. Would love to use onboard credit since we don't really have anything else to use it for. They wouldn't let me use it to book shore excursions ahead of time...

[www3traveler]

On Port Days, in the past, they have had special "Port Day Spa Specials".  Usually on Embarkation Day, you can tour the Spa for free.  I would go to the Spa then and check to see what the current protocol is.